I'm not really sure if you are saying the Blitz is good or bad? I just found out they don't have waterproof electronics, which is kind of a bummer but I wanted to get a Desert Rat body for it right away anyways and the Slashes also have that body available and they are waterproof.
What is this about spur gears? What is a spur gear and are they expensive and what causes them to break? Also do Blitz wheels fit on a Slash? Are any of the wheel compatable between brands?
The Blitz is a great truck. Each of the trucks on the market will have good and bad points. It's all about what you plan to do with the truck. If you have plans to hit the track and race. Do not get a Slash (in my opinion). As a racer I have seen may struggle trying to make a Slash fast at the track.
For spur gears, all the trucks run plastic spur gears with aluminum or steel pinion gears. The quality of the plastic in the spur gear, the mesh between the gears, and keeping the gear mesh clean are the contributing factors to spur gear failure. Of all the SC trucks on the market, the Slash is most well known for failing spur gears.
Take a look at the NEW Team Associated SC10 RS. It's comes with a water resistant speed control, receiver box, it's brushless, 2.4g radio, and it's an SC10!!!.